Capstan



A. A. COYLE AND W. S. IVHTCHELL.

CAPSTAN.

APPLICATION FILED MAR, 29, 1920. 1 QZQ QQU, Patented Aug. 8, 1922. v i V I a I I 2 SHEETS-SHEET I.

A. A. COYLE AND W. S. MITCHELL.

CAPSTAN.

APPLICATION FILED MAR. 29, 1920.

1 24,990, Patented Aug. 8, 1922.

2 SHEETS-SHEET 2.

entree starts @ATENT @FWQEE.

ALBERT A. COYLE AND WILLIAM S. MITCHELL, OF ST. LOUIS, MISSOURI.

CAPSTAN.

Specification of Letters Patent.

Patented Aug. 8, 21922.

Application filed March 29, 1920. Serial Ito. 389,839.

To all whom it may concern:

Be it known that we, ALBERT A. Conn and WILLIAM S. MITCHELL, citizens of the United States, residing at St. Louis, in the State of Missouri, have invented a new and useful Gapstan, of which the following is a specification.

This invention relates to new and useful improvements in capstan construction, and more particularly to capstans of the power yp An object of the invention is to provide a capstan having novel means for increasing the strength thereof together with means for changing the speed of rotation of the capstan.

A further object of the invention is to provide means for moving the operating gears of the capstan, into and out of operation to accomplish the changing of speed.

A still further object of the invention is to provide a device of this character to remove lateral strain usually directed to the drive shaft of capstans, to distribute the strain throughout the entire body of the capstan base to the end that the strength of the capstan is increased and the weight thereof decreased.

With the foregoing and other objects in view which will appear as the description proceeds, the inventionresides in the combination and arrangement of parts and in the details of construction hereinafter claimed and described, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made-within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawings Figure 1 illustrates a longitudinal sectional view through a capstan constructed in accordance with the present invention, the driveshaft thereof being shown as broken away, to illustrate the operating gears.

Figure 2 illustrates a transverse sectional view taken on line 22 of Figure 1.

Figure 3 illustrates a plan view of the capstan, the cover thereof being removed.

Referring to the drawings in detail, the capstan base is indicated at 5, and includes a relatively high circular member cut away as at 6, to provide openings to permit the gears which are housed by the base 5 to extend therethrough, and as shown, this base 5 is provided with a bed plate 7, extending beyond the side walls of the base 5 to enable the base to be secured to the deck 8, the bolts 9 being employed for securing the capstan.

The bed plate 7 is apertured to permit the operating shaft 10 to extend therethrbugh, the upper end of the operating shaft extendmg through an opening formed in the upper end of the revolving drum 11, which drum has the head 12, keyed thereto.

A power gear 13, is loosely mounted on the shaft 10 and cooperates with the gear wheels 14, which in turn are in mesh with the gear 15 formed internally of the revolving drum 11, at the base thereof. This gear 13 is provided with slots or key-ways 16, in which moves the key 17, which is positioned within a slotted portion of the shaft 10, the slotted portion being of a length to permit the key 17 to be moved to a osition above the gear 13,'as indicated by igure 1 of the drawings, which disconnects the gear 13 from the operating shaft 10, for purposes to be hereinafter more fully described.

Disposedin spaced relation around the periphery of the bed plate 7 are the roller bearings 18 which contact with the inner lower edge of the revolvin drum 11; the,

revolving drum 11 being 0 a size to substantially house the base 5, and as shown,

In order that the drum 11 may be insured against displacement, collars 21 and 28 are provided, which collars embrace the operating shaft 10 adjacent the upper and lower ends thereof, and are secured thereto by means of the set screws 22 and 29,which pass through suitable openings. It will thus be seen that movement of the drum 11 lon itudinally of the shaft is restricted. T e operating shaft 10 is provided with a longitudinal bore adapted to receive the operating rod 23, which rod has connection with the key. 17 for moving the key 17 into and out of operative relation with the gear 13, Which gear 13 through the medium of the gears 14:, causes the operation of the drum 11.

This key 17 may also be moved into and out of operative relation with the gear 13, by means of the hand wheel 24 having connection wth one end of the sleeve 11, which is threaded on the upper end of the operating rod 23 and is held against vertical move-.

' the upper end of the drum 11, is keyed or otherwise secured to the shaft 10, and this head carries the pawls 15' cooperating with the walls of the openings 16 formed in the head 12 and the sockets 14' in the drum 11.

From the foregoing it is obvious that when the drum 11 is operated through the gears 13 and 14, the same is revolved at a comparatively low speed, and the pawls are riding over the racked upper surface of the drum 11, but if it is desired to increase the speed of rotation of the drum, it is only necessary to disconnect the key 17 from the gear 13, by operating the rod 23, through the hand wheel 24, or from below the deck as above described, and connect the drum 11 to the operating shaft 10.

When the drum 11 is connected to the shaft 10 in this manner, it is obvious that the drum is revolved at a much higher speed.

It is to be understood however, that when the speed .of rotation of the drum is changed, by virtue of the changes in drive, the en ine supplying the power for the operating shaft 10, must be reversed in order that the pawls 15' will operate in the opposite direction and the direction of rotation of the drum 11 will be maintained the same.

Supported adjacent the lower endof the drum 11, and embracing, a portion of the shaft 10, is a bearing 27 through which the shaft operates.

Supported on the circular head 12 is a cap 30 provided with a depending annular flange 31, adapted to fit within'a recess formed in the head 12, so that the cap may be held in proper relation to guard the drum 11 to prevent water or moisture from entering the gears and operating mechanism of the capstan.

It is of course understood that the shaft 10 may extend through the deck 8, and lie 1. In a capstan, a base having a bed plate,

roller bearings supported in the periphery of the bed plate and in the base, adjacent to the upper end thereof, a revolving drum having an internal flange resting on the upper end of the base, portions of the drum contacting with the roller bearings, an operating shaft extending through the drum, a pinion movable with the operating shaft, a pinion in mesh with the first mentioned pinion, a gear formed within the lower portion of the drum the teeth thereof contacting with the teeth of the second mentioned pinion to rotate the drum when theshaft is rotated, and means for disconnecting the shaft and first mentioned pinion.

2. In a capstan, a base, ashaft extending through the base, a drum disposed on the base, a pinion having key-Ways mounted on the shaft, means for connecting the pinion and shaft, means for transmitting movement of the pinion to the drum, said means for connectingthe pinion and shaft including a rod extending through the shaft, a key movable with the rod and adapted to move into the key-ways of the pinion, and means at the upper end of the drum for clutching the drum to the shaft. j v

3. In a capstan, a base having a laterally extending bed plate, a drum mounted on the bed plate and having contact with the base: at a point intermediate the ends of ,the'

drum, said drum having engagement with the bed plate, an operating shaft extending through the base and drum, means mounted within the base and contacting with the drum for rotating. the drum, and means for clutching the drum to the operating shaft. In testimony that we claim the foregoing as our own, we have hereto afiixed our signatures in the presence of two witnesses.

ALBERT A. COYLE. WVILLIAM S. MITCHELL. Witnesses:

A. A. POLAND, S. S. CLARK. 

